Propylene Glycol Stearate

AKA: PROPYLENE GLYCOL MONOSTEARATE, 1323-39-3, Cerasynt PA, Octadecanoic acid, Monoester with 1, 2-propanediol, FEMA No. 2942, Propylene glycol palmitostearate, FEMA NO. 4208
Plant-Derived
Cleanser
Skin Conditioner
Clean
Stearic acid, monoester with propane-1,2-diol
Effective at 1.0%
Solubility insoluble in water
Formula
C21H42O3
Mol. Weight
342.60
CAS #
1323-39-3, 142-75-6
Form
Liquid
Functions
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Cleansing
Makes oil and water mix so dirt, makeup, and sunscreen can actually be washed away. The reason your face wash foams.
Locks in moisture
Traditional Use
Synthetic ester developed in the mid-20th century as an emulsifier and thickening agent for cosmetics. Functions to stabilize formulations and provide smooth, creamy texture.
EWG
1
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Concentration Guide
9.9e-05%
2.0%
0%14%
Reported use
CIR reported use: 0.000099-2
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Skin Types
all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory1 listing
🛡️Safety-assessed4 reviews
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR